Sewing-machine.



No. 645,295. y

w. HLAVACEK.

SEWING MACHINE.

(Application med June 7, 1898,)

Patented Mar. 13,1900.

(Nn Model.)

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VENZEL I-ILAVCEK, OF MEISSEN, GERMANY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 645,295, dated March 13, 1900.

Application led June 7, 1898. Serial No. 682,833. (No model.)

To all whom, it may concern:

Be it known that I, WENZEL HLAvoEK, a citizen of the Empire of Austria-Hungary,and a resident of Meissen, in the Kingdom of Saxony and German Empire, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification.

The object of the present invention is an improvement for reversing the motion of the feeding mechanism of a sewingmachine which permits the changing of the direction of the feeding during the fastest running of the machine.

The improvement is shown in the accompanying drawings, wherein- Figure l represents, as seen from below, the invention, showing the parts of the mechanism when the machine feeds forward. Fig. 2 shows the same View, but the parts in their relative position, when feeding backward. Fig. 3 is a cross-section through same on line :c of Fig. 1. Fig, 4 is a cross-section on line y y of Fig. 2 on an enlarged scale. Fig. 5 shows the principal part of Fig. 3 on an enlarged scale.

The vertical axis E, arranged in the vertical arm of the sewing-machine, imparts by means of an eccentric a to-and-fro motion to the feed-dog T through a lever A. The latter is not, as is ordinarily the case, formed by a single solid rod; but it consists of two pieces A and A', connected to each other by an intermediate piece H, articulated at g and g to A and A'. The piece H is provided with an elongation beyond the pivot g, so as toform a one-armed lever. The same has at one end and between the two pivots g and g' broader parts e and c'. The lever A is prolonged beyond the pivot g and guided in a piece F, fixed to the bed-plate of the machine. F permits only a displacement in longitudinal direction, but prevents that in lateral sense.

' Gr is a movable guide-block in which the lever A' is guided, forming thus the fulcrum for said lever. By shifting said piece G to one or the other side the proportion between the lever-arms is altered, and therefore also the length of the stitches. The reversing of the motion is attained by shifting the bar S by means of the arm 7L to one side or the other. With this bar S there is rigidly connected a piece S', having near its end agroove engaging with the connecting-piece H. It is obviousthat in the position of the parts shown in Fig. l the parts A, A', and H behave exactly like one solid piece. The movement of the feeding mechanism therefore takes place in the ordinary way. If, on the other hand, the piece S is shifted to the left, as shown in Fig. 2, the fulcrum of the connecting-piece is shifted from e to e'. Lever A' therefore executes its motion in opposite sense to lever A, and consequently the feeding mechanism acts in inverse sense.

The reversing device may be attached with- 'out much cost to any existing machine of the Singer type.

1. In combination,the feed mechanism comprising a feed-dog, the vertical shaft, the lever connected to said dog, the lever operated by said shaft, and a link connecting said levers, a fulcrum for said link and means for shifting said fulcrum, substantially as described.

2. In combination,the feed mechanism comprising the feed-dog, the lever connected thereto, the rotatable shaft, a second lever operated by the same, a link having a pivotal connection at one end to the first lever and a pivotal connection to the end of the second lever, an extension of said link to the rear of said second connection,fulcrum-points on said link intermediate of its pivotal connection and on said extension and a shiftable bearing adapted to engage the points between the pivots or said extensions.

In testimony whereof I aix my signature in presence of two witnesses.

WENZEL HLAvcEK.

Witnesses:

ALONZO E. WEMPLE, PAUL ARRAS. 

